Material based on a non-woven textile lap which may be used as reinforcement for impermeable coverings

Abstract

The present invention relates to a material which may be used as reinforcement for bituminous impermeable coverings of the type constituted by a non-woven fibrous lap. The material being characterized in that the lap is formed by a complex comprising an intermediate layer constituted by a non-woven fabric of polyester. The non-woven fabric serving as a support for glass fibers implanted in its thickness. The fibers project on each side of said support and are folded back thereon.

What is claimed is: 
     
       1. A material which may be used as reinforcement for bituminous impermeable coverings of the type constituted by a non-woven fibrous lap, said lap being formed by a complex comprising an intermediate layer constituted by a non-woven fabric of polyester, said non-woven fabric serving as a support for glass fibers implanted therein, said fibers projecting on each side of said non-woven fabric and folded back thereon.   
     
     
       2. The material of claim 1, wherein the lap is a non-woven fabric made from relatively compact continuous filaments of small -thickness, and the glass fibers are implanted in the non-woven fabric by a needling operation. 
     
     
       3. The material of claim 2, wherein the length of said glass fibers is such that, during said needling operation, said glass fibers are implanted in the lap of said non-woven fabric of polyester and emerge in the form of loops on side opposite to the side where the needles are inserted. 
     
     
       4. The material of claim 1, wherein after said material has been made, it is calendered and impregnated with an adhesive matter.